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In order for the data migration process to work, i need to delete the app from the simulator (/Users/kenpower/Library/Application Support/iPhone Simulator/4.2/Applications)\
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The unnumered data model is the "latest" one, copy it, using Design/DataModel/AddModelVersion and then make changes to the unnumbered version\
Then create a mapping model from the newly added version to the unumbered version\
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